Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4d1e636349e839…

MALICIOUS

PDF

73.3 KB Created: 2021-09-28 05:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 997f7703da673fcdf73faf3a358be109 SHA-1: 9fa269966c8e861fbb48dbf2637df6d0a2905439 SHA-256: ba4d1e636349e839c72992e111930dadf3c2b0ddae0ce2ac8706fe1200ab5097
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using compromised infrastructure for hosting malicious content. While no scripts were explicitly extracted, the nature of the links and the ML classifier's high confidence score point towards a malicious intent, likely to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.prodomasa.com/ckfinder/userfiles/files/35401175905.pdf In PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/21/nurevimaxuwavejipebera.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/sazubododopuvokige.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///33449757147.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/gamafumevetobojuta.pdfIn PDF document text
    • https://buzyhub.com/files/30816916675.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d89a9d5eae---gisifunogobezipovujune.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/jagowipuzoje.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/27933020218.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/33703473921.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/romenudujofonolatujifap.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/8ea68e097f1604e141161d58840926f6/ronuradenamej.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/mukedoz.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/14351294364.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/51589690765.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/68777400130.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/nepalepisegaram.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/kajobexar.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/78725444521.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/damumufogovamugotifofeb.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/rirugunokakosuja.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369dde4473e---vuzerukasowarabiw.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a14eda443c---19932494559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=acmarket+for+windowsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD058 18136 bytes
SHA-256: 8540898b15898265d5a9ef1ec32c64f9d9eb40dea9b0b2a1e9c0ec63ef389e92
font_02_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 10748 bytes
SHA-256: 256e487e6a52121b1586f4e6c8fe60f07e7a30c896c5d1fe681c9226f8082c65

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